CNN Top News - ... but why are swimming pools blue?

2016.08.13 00:05

... but why are swimming pools blue?

마린

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When two Olympic pools at Rio turned from azure blue to bright green earlier this week, people around the world were left scratching their heads.

원문출처 : http://www.cnn.com/2016/08/12/sport/why-are-swimming-pools-blue/index.html

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